🎨 Palette: [UX improvement] Enhance accessibility and visual feedback

[LVT-ENG]

💡 What: This PR introduces three micro-UX and accessibility enhancements:

1. Visual Feedback: Implemented the missing .loader CSS class in styles/main.css. This ensures that the "ASK PAU" button shows a rotating loader during the analysis process, as intended by the JavaScript logic.
2. Keyboard Accessibility: Updated requestPrivatePass in js/main.js to automatically focus the password input field when the Staff Access modal is opened, saving the user an extra click/tab.
3. Screen Reader Support: Added an aria-label to the #private-pass-input in index.html to provide clear context for assistive technologies.

🎯 Why: These small changes collectively make the interface feel more responsive and accessible, adhering to high UX standards and ensuring a smoother experience for all users.

📸 Before/After:

• Before: Clicking "ASK PAU" would disable the button with text but no visual spinner. The Staff Access modal required manual clicking into the input field.
• After: A gold rotating loader appears next to the executing text. The Staff Access input is focused immediately upon opening.

♿ Accessibility:

• Added aria-label to the password input.
• Improved focus management for modal interactions.

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PR created automatically by Jules for task 3411431885991634331 started by @LVT-ENG

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the user experience and accessibility of the application by adding visual feedback, improving keyboard navigation, and providing better support for screen readers. These changes make the interface more responsive and user-friendly.

Highlights

• Visual Feedback: Implemented the .loader CSS class to display a rotating loader when the 'ASK PAU' button is clicked, providing visual feedback during the analysis process.
• Keyboard Accessibility: Updated requestPrivatePass in js/main.js to automatically focus the password input field when the Staff Access modal is opened, improving keyboard navigation.
• Screen Reader Support: Added an aria-label to the #private-pass-input in index.html to provide clear context for assistive technologies.

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[gemini-code-assist]

Code Review

Este PR introduce buenas mejoras de accesibilidad y experiencia de usuario. Mis comentarios se centran en refinar aún más estas mejoras. En index.html, sugiero ajustar el aria-label y el placeholder para mayor claridad y consistencia. En js/main.js, señalo un aspecto importante de la gestión del foco en modales para completar la mejora de accesibilidad: restaurar el foco al elemento original cuando el modal se cierra. Los cambios en el CSS para el loader son correctos.

[gemini-code-assist]

¡Excelente mejora de accesibilidad al mover el foco al input!

Para completar el patrón de accesibilidad de un modal, es crucial devolver el foco al elemento que lo activó cuando el modal se cierra. De lo contrario, el foco se "pierde" en la página (a menudo vuelve al inicio del <body>), creando una mala experiencia para la navegación por teclado.

Para solucionarlo, puedes guardar el elemento activo antes de mostrar el modal y restaurar el foco al cerrarlo.

1. Añade una propiedad en el constructor:

constructor() {
    // ...
    this.previouslyFocusedElement = null;
    this.init();
}

2. Guarda el foco en requestPrivatePass:

requestPrivatePass() {
    this.previouslyFocusedElement = document.activeElement; // Guardar foco
    const modal = document.getElementById('private-pass-modal');
    modal.style.display = 'flex';
    const input = document.getElementById('private-pass-input');
    if (input) input.focus();
}

3. Restaura el foco en closePrivatePass:

closePrivatePass() {
    const modal = document.getElementById('private-pass-modal');
    modal.style.display = 'none';
    if (this.previouslyFocusedElement) {
        this.previouslyFocusedElement.focus(); // Restaurar foco
    }
}

Esto asegurará una experiencia de usuario fluida y accesible.

[gemini-code-assist]

Para mejorar la accesibilidad y la consistencia, te sugiero los siguientes cambios:

1. aria-label conciso: El valor de aria-label es una instrucción completa. Es mejor que sea una etiqueta concisa, como "Credencial de acceso", ya que el párrafo anterior ya da el contexto.
2. Consistencia de idioma: El placeholder "Credential ID" está en inglés. Sería bueno traducirlo a "ID de Credencial" para que coincida con el resto de la interfaz.

Adicionalmente, considera mover los estilos en línea de este elemento a una clase CSS en styles/main.css para mejorar la mantenibilidad.

Suggested change

	<input type="password" id="private-pass-input" placeholder="Credential ID" aria-label="Introduce tu credencial de acceso" style="width:100%; padding:1rem; background:#0d0e10; border:1px solid rgba(255,255,255,0.1); color:#F5EFE6; margin-bottom:2rem;">
	<input type="password" id="private-pass-input" placeholder="ID de Credencial" aria-label="Credencial de acceso" style="width:100%; padding:1rem; background:#0d0e10; border:1px solid rgba(255,255,255,0.1); color:#F5EFE6; margin-bottom:2rem;">